2-[(4-methoxy-2-nitrophenyl)azo]-N-(2-methoxyphenyl)-3-oxobutyramide

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Valid method (67/548/EEC, Annex V, A. 17)

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

GLP compliance:

yes (incl. QA statement)

Contact with:

powdered cellulose

Sample tested:

reference mixture (not specified)

Remarks:

migrated information

Parameter:

maximum burning rate

Result:

ca. 1.32 other: mm/s (migrated information)

Remarks on result:

other: The highest burning rate 1.32 mm/s was found for the mixture with 55 wt.% oxidizer.

Sample tested:

test mixture (not specified)

Remarks:

migrated information

Parameter:

maximum burning rate

Result:

ca. 1.6 other: mm/s (migrated information)

Remarks on result:

other: Due to the fact that the maximum burning rate of the mixtures of the test item with cellulose is higher than the maximum burning rate of the reference mixture additional main tests have been performed to exclude a false positive result (see below).

1.1.1. Additional Main Tests

The mixture of test item and cellulose showed a burning rate near to the one of the mixture of barium nitrate and cellulose. Therefore the following two additional experiments were performed in order to exclude oxidizing properties and to verify the result of the main test:

·        Test item (50 and 60wt.%) mixed with kieselguhrandbarium nitrate (60 wt.%) mixed with kieselguhr

·        Inert atmosphere (Argon) with a glowing coil as ignition source (50 and 60 wt.% test item mixed with cellulose and 60  wt.% barium nitrate mixed with cellulose.

Main Test with Kieselguhr

The following table shows the results of mixtures with kieselguhr.

Test item[%]	Burning time over 200 mm [s]	Burning rate [mm/s]
50	85	2.35
60	105	1.90
Barium nitrate [%]	Burning time over 200 mm [s]	Burning rate [mm/s]
60	no ignition	---

The mixture of test item (50 and 60 %) with Kieselguhr showed a propagating combustion. Due to the fact that Kieselguhr is an inert substance and does not burn it has to be concluded from this test, that the melted test item sustained the combustion if soaked in a porous material. In mixture with Kieselguhr the melted test item was soaked in the porous Kieselguhr and led to an increase of the free surface, which sustained the combustion.

From this test it can be concluded that also in mixture with cellulose the melted test item was soaked in the porous structure of the cellulose and sustained the combustion. The high burning rate of the mixtures of test item with cellulose was not caused by oxidizing properties of the test item but by the combustibility of the melted test item in the porous materials cellulose or Kieselguhr.

 

Main Test under Argon Atmosphere

Mixtures of the test item with cellulose were prepared using 50 and 60 wt.% of the test item. A mixture of barium nitrate with cellulose was prepared using 60 wt.% of barium nitrate. The mixtures were tested under argon atmosphere.

The following table shows the results of mixtures in an inert atmosphere.

Test item[%]	Burning time over 200 mm [s]	Burning rate [mm/s]
50	no ignition, significant development of smoke	---
60	no ignition, significant development of smoke	---
Barium nitrate [%]	Burning time over 200 mm [s]	Burning rate [mm/s]
60	331	0.60

Interpretation of results:

other: no oxidising properties

Remarks:

Migrated information

Key value for chemical safety assessment

Oxidising properties:

non oxidising